Prismatic Effect

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Prismatic effect is the deviation of light produced when viewing through a point away from the optical center of a spectacle lens.

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Prismatic effect occurs when you look through a spectacle lens away from its optical center, causing light to change direction. The amount depends on the lens power and how far from the optical center you look, and it can make an object appear shifted.

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References (1)
  1. Keating, M. P. Geometric, Physical, and Visual Optics (2nd ed., Chapter 10) & Benjamin, W. J. Borish's Clinical Refraction (2nd ed., Chapter 1).